Brussels, 13/01/2012 (Agence Europe) - European markets fell sharply on Friday afternoon when rumours started circulating that US rating agency Standard and Poor's might be thinking of downgrading the debt of a number of eurozone countries (not Germany, the Netherlands or Luxembourg, however). In December, S&P's put under negative surveillance the long-term credit ratings of the six eurozone nations currently have the top rating, AAA, namely Germany, Austria, Finland, France, Luxembourg and...